Validation Exceptions handling to combine with existing exception handling

ValidationExceptionHandling.cs

if (exception is ValidationException validationException)
{
    string[] validationErrorMessages = validationException.Errors.Select(x => x.ErrorMessage).ToArray();
    
    ValidationProblemDetails problemDetails = new ValidationProblemDetails
    {
        Instance = req.Path,
        Status = StatusCodes.Status400BadRequest,
        Title = "One or more validation errors occurred.",
        Detail = $"{string.Join('-', validationErrorMessages)}"
    };

    problemDetails.Errors.Add("CommandValidationErrors", validationErrorMessages);

    return new BadRequestObjectResult(problemDetails);
}